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Acquisitions and disposals - Additional Information (Details)
₨ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 28, 2018
USD ($)
Jul. 31, 2020
USD ($)
Jul. 31, 2020
INR (₨)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 27, 2018
USD ($)
Business Acquisition [Line Items]                
Merger and Acquisition exploration costs         $ 400,000      
Acquisition related costs         0 $ (1,400,000) $ (4,300,000)  
Reimbursement of costs           3,500,000    
Acquisition-related costs           900,000    
Remeasurement of deferred contingent consideration           100,000    
Goodwill $ 67,600,000       70,200,000 68,800,000 67,600,000  
Equity investments fair value               $ 1,600,000
Impairment charges         0 4,800,000 $ 12,600,000  
Deferred contingent consideration         $ 0 500,000    
Luxfer Holdings NA, LLC                
Business Acquisition [Line Items]                
Percentage of equity interest acquired   51.00%            
Consideration of disposal   $ 2,200,000            
Amount of debt instrument forgiveness   2,100,000            
Fair value of net assets of acquiree   4,000,000.0            
Fair value of net assets acquired   2,100,000            
Goodwill   0            
Cash acquired   2,700,000            
Inventory acquired   1,100,000            
Accounts and other receivables acquired   800,000            
Property, plant, and equipment acquired   200,000            
Accounts payable assumed from acquisition   800,000            
Intangible assets acquired   0            
Impairment charges   2,400,000            
Revenue of acquiree since acquisition date $ 0              
Luxfer Holdings NA, LLC | Gas Transport Leasing LLC                
Business Acquisition [Line Items]                
Consideration of disposal   $ 2,200,000            
Luxfer Utlam India Private Limited                
Business Acquisition [Line Items]                
VIEs ownership percentage         51.00%      
Proceeds from sale of joint venture partner     $ 1,800,000 ₨ 137.4        
Luxfer Utlam India Private Limited | Maximum                
Business Acquisition [Line Items]                
Gain on sale of investments     $ 100,000          
Luxfer Holdings NA, LLC | Variable Interest Entity, Not Primary Beneficiary                
Business Acquisition [Line Items]                
VIEs ownership percentage   49.00%            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Magnesium Elektron CZ s.r.o. Subsidiary                
Business Acquisition [Line Items]                
Net gain on disposal           $ 2,900,000